脊髓空洞症()。
A.早期以颈肩痛为主
B.感觉正常、运动异常
C.感觉分离
D.斜角肌试验阳性
E.脊髓侧束锥体束损害表现突出
参考答案:C
A firewall is a (68) system designed to (69) all organization, s network against threats.
A.prevent
B.protect
C.develop
D.exploit
中标